Pioneer SUPER TUNER III DEH-503 Owner's Manual page 5

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When the power amp is being linked with
this system, be sure not te cannect the
biue lead to the amp's power terminal.
Likewise, when Hnking this systern with
the auto-antenna, do not connect to
power terminal fer the antenna. Such
conection can make overcurrent Cause
malfunctions.
When the unit is mounted in a vehicle
whose ignition switch does not have the
ACC (accessory) position as shown in
Fig. 2, be sure ta connect the red lead of
the unit to the terminal controlled by the
ignition switch ONVOFF position. if yau do
not, the vehicle battery may go flat when
you leave your vehicle far several hours.
(Fig. 1: ACC pasitian/Fig. 2: No ACC
position}